Question

The correct reaction profile diagram for a positive catalyst reaction .

• A.

  

• B.

  

• C.

  

• D.

  

Hint:

Catalysts speed up reactions by decreasing activation energy, but they do not alter the enthalpy change (∆H) of the reaction

Answer 1

The Correct Option is C

A positive catalyst increases the reaction rate by lowering the activation energy. Activation energy is the minimum energy required for reactants to form products. In the given diagrams:

1. Option (1): Incorrect. The diagram does not depict a lowered activation energy.
2. Option (2): This graph does not represent the effect of a catalyst, as the activation energy remains unchanged.
3. Option (3): Correct. This diagram clearly shows a decrease in the activation energy when a catalyst is present while keeping the relative energies of reactants and products unchanged.
4. Option (4) : Incorrect. While the curve changes, it does not correctly indicate the role of a positive catalyst.

Thus, the correct diagram representing a positive catalyst is option (3)